New PinModel interface (spec_for / layout / source) + a single apply_model(
Part*, const PinModel&) that materialises missing layout pins and sets each
pin's spec only where the model speaks (spec.source != None), so one source
never clobbers another's. ConnectorModel wraps pin_role/pin_layout;
BsdlPinModel wraps a parsed BsdlModel (indexed by port name and physical pad).
set-connector-type and screen_settype now use ConnectorModel + apply_model;
attach-bsdl and the restore re-apply keep calling apply_bsdl, now a thin
adapter over apply_model. Behaviour-preserving: unit tests (73 cases) green and
the real 8-card system re-runs identically (1517/1517 bound, same JTAG
findings). Covered by test_pin_model.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
François
cb61e9b084